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Valuation and Qualifying Accounts and Reserves (Schedule II) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2018 | May 31, 2017 | May 31, 2016
Allowance for Doubtful Accounts, Current |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at Beginning of Period |  | $ 44,138 |  | $ 24,600 | $ 24,526
Additions Charged to Selling, General and Administrative |  | 4,487 |  | 13,747 | 8,692
(Deductions) Additions | [1] | (2,281) |  | 5,791 | (8,618)
Balance at End of Period |  | 46,344 |  | 44,138 | 24,600
Accrued Product Liability Reserves, Current |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at Beginning of Period |  | 14,932 |  | 25,100 | 11,916
Additions Charged to Selling, General and Administrative |  | 6,169 |  | 5,262 | 13,848
(Deductions) Additions | [2] | (8,201) |  | (15,430) | (664)
Balance at End of Period |  | 12,900 |  | 14,932 | 25,100
Accrued Loss Reserves, Current |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at Beginning of Period |  | 1,102 |  | 1,053 | 1,383
Additions Charged to Selling, General and Administrative |  | 413 |  | 636 | 230
Acquisitions (Disposals) of Businesses and Reclassifications | [3] |  |  | (322) |
(Deductions) Additions | [2] | (371) |  | (265) | (560)
Balance at End of Period |  | 1,144 |  | 1,102 | 1,053
Accrued Product Liability, Noncurrent |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at Beginning of Period |  | 28,222 |  | 29,045 | 29,768
Additions Charged to Selling, General and Administrative |  | 16,581 |  | 15,005 | 9,637
Acquisitions (Disposals) of Businesses and Reclassifications |  |  |  | 281 |
(Deductions) Additions | [2] | (14,901) |  | (16,109) | (10,360)
Balance at End of Period |  | 29,902 |  | 28,222 | 29,045
Environmental Reserves, Noncurrent |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Balance at Beginning of Period |  | 1,747 |  | 1,676 | 3,498
Additions Charged to Selling, General and Administrative |  | 5,350 | [4] | 404 | 730
Acquisitions (Disposals) of Businesses and Reclassifications | [3] |  |  | 328 |
(Deductions) Additions |  | (3,526) |  | (661) | (2,552)
Balance at End of Period |  | $ 3,571 |  | $ 1,747 | $ 1,676
[1] | Uncollectible accounts written off, net of recoveries
[2] | Primarily claims paid during the year, net of insurance contributions
[3] | Primarily transfers between current and noncurrent
[4] | Approximately $1.7 million of the additions are reflected in the line item entitled, “Restructuring Expense,” in our Consolidated Statements of Income.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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